September 2015
Beginner
288 pages
5h 39m
English
Content preview from Oracle PL/SQL in 10 Minutes, Sams Teach Yourself
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Lesson 7. Advanced Data Filtering
This lesson shows you how to combine WHERE clauses to create powerful and sophisticated search conditions, and how to use the NOT and IN operators.
Combining WHERE Clauses
All the WHERE clauses introduced in Lesson 6, “Filtering Data,” filter data on a single criterion. For a greater degree of filter control, Oracle allows you to specify multiple WHERE clauses. You may use these clauses in two ways: as AND clauses or as OR clauses.
Operator
A special keyword used to join or change clauses in a WHERE clause. Also known as logical operators.
Using the AND Operator
To filter by more than one column, you use the AND operator to append conditions to your WHERE clause. The following code demonstrates this:
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